(train horn) vo: wherever our trains go, the economy comes to life. norfolk southern. one line, infinite possibilities. lookin' good, flo! feelin' good! feelin' real good! [ engine revs ] boat protection people love. now, that's progressive. call or click today. >>> i'm wolf blitzer reporting live from boston. fredricka whitfield is joining us from the cnn center in atlanta. we have new information we're watching right now. we want to share with you about the boston marathon bombing investigation. cnn can exclusively reveal that the alleged bomber tamerlan tsarnaev had video of a known jihadist on his personal youtube channel. the video is of a man named abu dujana. he was killed by russian forced last december. he died in the capital of dagestan, which is in russia, where tamerlan's father currently lives and where tamerlan spent at least some time, maybe six months, if not more, in 2012. cnn cannot confirm that tamerlan and abu dujana actually met in pakistan. the video had been deleted from tamerlan's youtube account but was tracked down by cnn. here's the latest in